Williams waits on White

The tough-tackling Sale Sharks star has been ordered by doctor James Robson and the medical team to undergo a scan on the right knee he injured against Leeds Tykes last Friday.

The 26-year-old has been one of Scotland's best performers during their disappointing campaign so far but the prospect of him lining up alongside Simon Taylor was an exciting one.

Williams has already been forced to rule out Northampton back-row forward Ross Beattie, who is is remaining under the care of his club's medical team after he suffered a head injury in their loss to London Wasps on Sunday.

That has prompted Williams to draft in Edinburgh's Simon Cross and Glasgow's Paul Dearlove, who are both uncapped, to his squad for Tuesday's training session in Stirling.

However, Cross' time with the squad was short-lived. He is suffering from a stomach bug and was sent home so as not to pass it on to anyone else.